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[karo-tx-linux.git] / fs / gfs2 / lops.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/mempool.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/bio.h>
18 #include <linux/fs.h>
19 #include <linux/list_sort.h>
20
21 #include "gfs2.h"
22 #include "incore.h"
23 #include "inode.h"
24 #include "glock.h"
25 #include "log.h"
26 #include "lops.h"
27 #include "meta_io.h"
28 #include "recovery.h"
29 #include "rgrp.h"
30 #include "trans.h"
31 #include "util.h"
32 #include "trace_gfs2.h"
33
34 /**
35  * gfs2_pin - Pin a buffer in memory
36  * @sdp: The superblock
37  * @bh: The buffer to be pinned
38  *
39  * The log lock must be held when calling this function
40  */
41 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
42 {
43         struct gfs2_bufdata *bd;
44
45         BUG_ON(!current->journal_info);
46
47         clear_buffer_dirty(bh);
48         if (test_set_buffer_pinned(bh))
49                 gfs2_assert_withdraw(sdp, 0);
50         if (!buffer_uptodate(bh))
51                 gfs2_io_error_bh(sdp, bh);
52         bd = bh->b_private;
53         /* If this buffer is in the AIL and it has already been written
54          * to in-place disk block, remove it from the AIL.
55          */
56         spin_lock(&sdp->sd_ail_lock);
57         if (bd->bd_tr)
58                 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
59         spin_unlock(&sdp->sd_ail_lock);
60         get_bh(bh);
61         atomic_inc(&sdp->sd_log_pinned);
62         trace_gfs2_pin(bd, 1);
63 }
64
65 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
66 {
67         return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
68 }
69
70 static void maybe_release_space(struct gfs2_bufdata *bd)
71 {
72         struct gfs2_glock *gl = bd->bd_gl;
73         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
74         struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
75         unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
76         struct gfs2_bitmap *bi = rgd->rd_bits + index;
77
78         if (bi->bi_clone == NULL)
79                 return;
80         if (sdp->sd_args.ar_discard)
81                 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
82         memcpy(bi->bi_clone + bi->bi_offset,
83                bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
84         clear_bit(GBF_FULL, &bi->bi_flags);
85         rgd->rd_free_clone = rgd->rd_free;
86         rgd->rd_extfail_pt = rgd->rd_free;
87 }
88
89 /**
90  * gfs2_unpin - Unpin a buffer
91  * @sdp: the filesystem the buffer belongs to
92  * @bh: The buffer to unpin
93  * @ai:
94  * @flags: The inode dirty flags
95  *
96  */
97
98 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
99                        struct gfs2_trans *tr)
100 {
101         struct gfs2_bufdata *bd = bh->b_private;
102
103         BUG_ON(!buffer_uptodate(bh));
104         BUG_ON(!buffer_pinned(bh));
105
106         lock_buffer(bh);
107         mark_buffer_dirty(bh);
108         clear_buffer_pinned(bh);
109
110         if (buffer_is_rgrp(bd))
111                 maybe_release_space(bd);
112
113         spin_lock(&sdp->sd_ail_lock);
114         if (bd->bd_tr) {
115                 list_del(&bd->bd_ail_st_list);
116                 brelse(bh);
117         } else {
118                 struct gfs2_glock *gl = bd->bd_gl;
119                 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
120                 atomic_inc(&gl->gl_ail_count);
121         }
122         bd->bd_tr = tr;
123         list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
124         spin_unlock(&sdp->sd_ail_lock);
125
126         clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
127         trace_gfs2_pin(bd, 0);
128         unlock_buffer(bh);
129         atomic_dec(&sdp->sd_log_pinned);
130 }
131
132 static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
133 {
134         BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
135                (sdp->sd_log_flush_head != sdp->sd_log_head));
136
137         if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
138                 sdp->sd_log_flush_head = 0;
139 }
140
141 static u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
142 {
143         unsigned int lbn = sdp->sd_log_flush_head;
144         struct gfs2_journal_extent *je;
145         u64 block;
146
147         list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
148                 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
149                         block = je->dblock + lbn - je->lblock;
150                         gfs2_log_incr_head(sdp);
151                         return block;
152                 }
153         }
154
155         return -1;
156 }
157
158 /**
159  * gfs2_end_log_write_bh - end log write of pagecache data with buffers
160  * @sdp: The superblock
161  * @bvec: The bio_vec
162  * @error: The i/o status
163  *
164  * This finds the relavent buffers and unlocks then and sets the
165  * error flag according to the status of the i/o request. This is
166  * used when the log is writing data which has an in-place version
167  * that is pinned in the pagecache.
168  */
169
170 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
171                                   blk_status_t error)
172 {
173         struct buffer_head *bh, *next;
174         struct page *page = bvec->bv_page;
175         unsigned size;
176
177         bh = page_buffers(page);
178         size = bvec->bv_len;
179         while (bh_offset(bh) < bvec->bv_offset)
180                 bh = bh->b_this_page;
181         do {
182                 if (error)
183                         set_buffer_write_io_error(bh);
184                 unlock_buffer(bh);
185                 next = bh->b_this_page;
186                 size -= bh->b_size;
187                 brelse(bh);
188                 bh = next;
189         } while(bh && size);
190 }
191
192 /**
193  * gfs2_end_log_write - end of i/o to the log
194  * @bio: The bio
195  * @error: Status of i/o request
196  *
197  * Each bio_vec contains either data from the pagecache or data
198  * relating to the log itself. Here we iterate over the bio_vec
199  * array, processing both kinds of data.
200  *
201  */
202
203 static void gfs2_end_log_write(struct bio *bio)
204 {
205         struct gfs2_sbd *sdp = bio->bi_private;
206         struct bio_vec *bvec;
207         struct page *page;
208         int i;
209
210         if (bio->bi_status)
211                 fs_err(sdp, "Error %d writing to log\n", bio->bi_status);
212
213         bio_for_each_segment_all(bvec, bio, i) {
214                 page = bvec->bv_page;
215                 if (page_has_buffers(page))
216                         gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
217                 else
218                         mempool_free(page, gfs2_page_pool);
219         }
220
221         bio_put(bio);
222         if (atomic_dec_and_test(&sdp->sd_log_in_flight))
223                 wake_up(&sdp->sd_log_flush_wait);
224 }
225
226 /**
227  * gfs2_log_flush_bio - Submit any pending log bio
228  * @sdp: The superblock
229  * @op: REQ_OP
230  * @op_flags: req_flag_bits
231  *
232  * Submit any pending part-built or full bio to the block device. If
233  * there is no pending bio, then this is a no-op.
234  */
235
236 void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
237 {
238         if (sdp->sd_log_bio) {
239                 atomic_inc(&sdp->sd_log_in_flight);
240                 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
241                 submit_bio(sdp->sd_log_bio);
242                 sdp->sd_log_bio = NULL;
243         }
244 }
245
246 /**
247  * gfs2_log_alloc_bio - Allocate a new bio for log writing
248  * @sdp: The superblock
249  * @blkno: The next device block number we want to write to
250  *
251  * This should never be called when there is a cached bio in the
252  * super block. When it returns, there will be a cached bio in the
253  * super block which will have as many bio_vecs as the device is
254  * happy to handle.
255  *
256  * Returns: Newly allocated bio
257  */
258
259 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
260 {
261         struct super_block *sb = sdp->sd_vfs;
262         struct bio *bio;
263
264         BUG_ON(sdp->sd_log_bio);
265
266         bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
267         bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
268         bio->bi_bdev = sb->s_bdev;
269         bio->bi_end_io = gfs2_end_log_write;
270         bio->bi_private = sdp;
271
272         sdp->sd_log_bio = bio;
273
274         return bio;
275 }
276
277 /**
278  * gfs2_log_get_bio - Get cached log bio, or allocate a new one
279  * @sdp: The superblock
280  * @blkno: The device block number we want to write to
281  *
282  * If there is a cached bio, then if the next block number is sequential
283  * with the previous one, return it, otherwise flush the bio to the
284  * device. If there is not a cached bio, or we just flushed it, then
285  * allocate a new one.
286  *
287  * Returns: The bio to use for log writes
288  */
289
290 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno)
291 {
292         struct bio *bio = sdp->sd_log_bio;
293         u64 nblk;
294
295         if (bio) {
296                 nblk = bio_end_sector(bio);
297                 nblk >>= sdp->sd_fsb2bb_shift;
298                 if (blkno == nblk)
299                         return bio;
300                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
301         }
302
303         return gfs2_log_alloc_bio(sdp, blkno);
304 }
305
306
307 /**
308  * gfs2_log_write - write to log
309  * @sdp: the filesystem
310  * @page: the page to write
311  * @size: the size of the data to write
312  * @offset: the offset within the page 
313  *
314  * Try and add the page segment to the current bio. If that fails,
315  * submit the current bio to the device and create a new one, and
316  * then add the page segment to that.
317  */
318
319 static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
320                            unsigned size, unsigned offset)
321 {
322         u64 blkno = gfs2_log_bmap(sdp);
323         struct bio *bio;
324         int ret;
325
326         bio = gfs2_log_get_bio(sdp, blkno);
327         ret = bio_add_page(bio, page, size, offset);
328         if (ret == 0) {
329                 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
330                 bio = gfs2_log_alloc_bio(sdp, blkno);
331                 ret = bio_add_page(bio, page, size, offset);
332                 WARN_ON(ret == 0);
333         }
334 }
335
336 /**
337  * gfs2_log_write_bh - write a buffer's content to the log
338  * @sdp: The super block
339  * @bh: The buffer pointing to the in-place location
340  * 
341  * This writes the content of the buffer to the next available location
342  * in the log. The buffer will be unlocked once the i/o to the log has
343  * completed.
344  */
345
346 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
347 {
348         gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh));
349 }
350
351 /**
352  * gfs2_log_write_page - write one block stored in a page, into the log
353  * @sdp: The superblock
354  * @page: The struct page
355  *
356  * This writes the first block-sized part of the page into the log. Note
357  * that the page must have been allocated from the gfs2_page_pool mempool
358  * and that after this has been called, ownership has been transferred and
359  * the page may be freed at any time.
360  */
361
362 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
363 {
364         struct super_block *sb = sdp->sd_vfs;
365         gfs2_log_write(sdp, page, sb->s_blocksize, 0);
366 }
367
368 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
369                                       u32 ld_length, u32 ld_data1)
370 {
371         struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
372         struct gfs2_log_descriptor *ld = page_address(page);
373         clear_page(ld);
374         ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
375         ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
376         ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
377         ld->ld_type = cpu_to_be32(ld_type);
378         ld->ld_length = cpu_to_be32(ld_length);
379         ld->ld_data1 = cpu_to_be32(ld_data1);
380         ld->ld_data2 = 0;
381         return page;
382 }
383
384 static void gfs2_check_magic(struct buffer_head *bh)
385 {
386         void *kaddr;
387         __be32 *ptr;
388
389         clear_buffer_escaped(bh);
390         kaddr = kmap_atomic(bh->b_page);
391         ptr = kaddr + bh_offset(bh);
392         if (*ptr == cpu_to_be32(GFS2_MAGIC))
393                 set_buffer_escaped(bh);
394         kunmap_atomic(kaddr);
395 }
396
397 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
398 {
399         struct gfs2_bufdata *bda, *bdb;
400
401         bda = list_entry(a, struct gfs2_bufdata, bd_list);
402         bdb = list_entry(b, struct gfs2_bufdata, bd_list);
403
404         if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
405                 return -1;
406         if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
407                 return 1;
408         return 0;
409 }
410
411 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
412                                 unsigned int total, struct list_head *blist,
413                                 bool is_databuf)
414 {
415         struct gfs2_log_descriptor *ld;
416         struct gfs2_bufdata *bd1 = NULL, *bd2;
417         struct page *page;
418         unsigned int num;
419         unsigned n;
420         __be64 *ptr;
421
422         gfs2_log_lock(sdp);
423         list_sort(NULL, blist, blocknr_cmp);
424         bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
425         while(total) {
426                 num = total;
427                 if (total > limit)
428                         num = limit;
429                 gfs2_log_unlock(sdp);
430                 page = gfs2_get_log_desc(sdp,
431                                          is_databuf ? GFS2_LOG_DESC_JDATA :
432                                          GFS2_LOG_DESC_METADATA, num + 1, num);
433                 ld = page_address(page);
434                 gfs2_log_lock(sdp);
435                 ptr = (__be64 *)(ld + 1);
436
437                 n = 0;
438                 list_for_each_entry_continue(bd1, blist, bd_list) {
439                         *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
440                         if (is_databuf) {
441                                 gfs2_check_magic(bd1->bd_bh);
442                                 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
443                         }
444                         if (++n >= num)
445                                 break;
446                 }
447
448                 gfs2_log_unlock(sdp);
449                 gfs2_log_write_page(sdp, page);
450                 gfs2_log_lock(sdp);
451
452                 n = 0;
453                 list_for_each_entry_continue(bd2, blist, bd_list) {
454                         get_bh(bd2->bd_bh);
455                         gfs2_log_unlock(sdp);
456                         lock_buffer(bd2->bd_bh);
457
458                         if (buffer_escaped(bd2->bd_bh)) {
459                                 void *kaddr;
460                                 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
461                                 ptr = page_address(page);
462                                 kaddr = kmap_atomic(bd2->bd_bh->b_page);
463                                 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
464                                        bd2->bd_bh->b_size);
465                                 kunmap_atomic(kaddr);
466                                 *(__be32 *)ptr = 0;
467                                 clear_buffer_escaped(bd2->bd_bh);
468                                 unlock_buffer(bd2->bd_bh);
469                                 brelse(bd2->bd_bh);
470                                 gfs2_log_write_page(sdp, page);
471                         } else {
472                                 gfs2_log_write_bh(sdp, bd2->bd_bh);
473                         }
474                         gfs2_log_lock(sdp);
475                         if (++n >= num)
476                                 break;
477                 }
478
479                 BUG_ON(total < num);
480                 total -= num;
481         }
482         gfs2_log_unlock(sdp);
483 }
484
485 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
486 {
487         unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
488         unsigned int nbuf;
489         if (tr == NULL)
490                 return;
491         nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
492         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
493 }
494
495 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
496 {
497         struct list_head *head;
498         struct gfs2_bufdata *bd;
499
500         if (tr == NULL)
501                 return;
502
503         head = &tr->tr_buf;
504         while (!list_empty(head)) {
505                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
506                 list_del_init(&bd->bd_list);
507                 gfs2_unpin(sdp, bd->bd_bh, tr);
508         }
509 }
510
511 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
512                                struct gfs2_log_header_host *head, int pass)
513 {
514         if (pass != 0)
515                 return;
516
517         jd->jd_found_blocks = 0;
518         jd->jd_replayed_blocks = 0;
519 }
520
521 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
522                                 struct gfs2_log_descriptor *ld, __be64 *ptr,
523                                 int pass)
524 {
525         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
526         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
527         struct gfs2_glock *gl = ip->i_gl;
528         unsigned int blks = be32_to_cpu(ld->ld_data1);
529         struct buffer_head *bh_log, *bh_ip;
530         u64 blkno;
531         int error = 0;
532
533         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
534                 return 0;
535
536         gfs2_replay_incr_blk(jd, &start);
537
538         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
539                 blkno = be64_to_cpu(*ptr++);
540
541                 jd->jd_found_blocks++;
542
543                 if (gfs2_revoke_check(jd, blkno, start))
544                         continue;
545
546                 error = gfs2_replay_read_block(jd, start, &bh_log);
547                 if (error)
548                         return error;
549
550                 bh_ip = gfs2_meta_new(gl, blkno);
551                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
552
553                 if (gfs2_meta_check(sdp, bh_ip))
554                         error = -EIO;
555                 else
556                         mark_buffer_dirty(bh_ip);
557
558                 brelse(bh_log);
559                 brelse(bh_ip);
560
561                 if (error)
562                         break;
563
564                 jd->jd_replayed_blocks++;
565         }
566
567         return error;
568 }
569
570 /**
571  * gfs2_meta_sync - Sync all buffers associated with a glock
572  * @gl: The glock
573  *
574  */
575
576 static void gfs2_meta_sync(struct gfs2_glock *gl)
577 {
578         struct address_space *mapping = gfs2_glock2aspace(gl);
579         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
580         int error;
581
582         if (mapping == NULL)
583                 mapping = &sdp->sd_aspace;
584
585         filemap_fdatawrite(mapping);
586         error = filemap_fdatawait(mapping);
587
588         if (error)
589                 gfs2_io_error(gl->gl_name.ln_sbd);
590 }
591
592 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
593 {
594         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
595         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
596
597         if (error) {
598                 gfs2_meta_sync(ip->i_gl);
599                 return;
600         }
601         if (pass != 1)
602                 return;
603
604         gfs2_meta_sync(ip->i_gl);
605
606         fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
607                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
608 }
609
610 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
611 {
612         struct gfs2_meta_header *mh;
613         unsigned int offset;
614         struct list_head *head = &sdp->sd_log_le_revoke;
615         struct gfs2_bufdata *bd;
616         struct page *page;
617         unsigned int length;
618
619         gfs2_write_revokes(sdp);
620         if (!sdp->sd_log_num_revoke)
621                 return;
622
623         length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
624         page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
625         offset = sizeof(struct gfs2_log_descriptor);
626
627         list_for_each_entry(bd, head, bd_list) {
628                 sdp->sd_log_num_revoke--;
629
630                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
631
632                         gfs2_log_write_page(sdp, page);
633                         page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
634                         mh = page_address(page);
635                         clear_page(mh);
636                         mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
637                         mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
638                         mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
639                         offset = sizeof(struct gfs2_meta_header);
640                 }
641
642                 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
643                 offset += sizeof(u64);
644         }
645         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
646
647         gfs2_log_write_page(sdp, page);
648 }
649
650 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
651 {
652         struct list_head *head = &sdp->sd_log_le_revoke;
653         struct gfs2_bufdata *bd;
654         struct gfs2_glock *gl;
655
656         while (!list_empty(head)) {
657                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
658                 list_del_init(&bd->bd_list);
659                 gl = bd->bd_gl;
660                 atomic_dec(&gl->gl_revokes);
661                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
662                 kmem_cache_free(gfs2_bufdata_cachep, bd);
663         }
664 }
665
666 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
667                                   struct gfs2_log_header_host *head, int pass)
668 {
669         if (pass != 0)
670                 return;
671
672         jd->jd_found_revokes = 0;
673         jd->jd_replay_tail = head->lh_tail;
674 }
675
676 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
677                                    struct gfs2_log_descriptor *ld, __be64 *ptr,
678                                    int pass)
679 {
680         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
681         unsigned int blks = be32_to_cpu(ld->ld_length);
682         unsigned int revokes = be32_to_cpu(ld->ld_data1);
683         struct buffer_head *bh;
684         unsigned int offset;
685         u64 blkno;
686         int first = 1;
687         int error;
688
689         if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
690                 return 0;
691
692         offset = sizeof(struct gfs2_log_descriptor);
693
694         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
695                 error = gfs2_replay_read_block(jd, start, &bh);
696                 if (error)
697                         return error;
698
699                 if (!first)
700                         gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
701
702                 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
703                         blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
704
705                         error = gfs2_revoke_add(jd, blkno, start);
706                         if (error < 0) {
707                                 brelse(bh);
708                                 return error;
709                         }
710                         else if (error)
711                                 jd->jd_found_revokes++;
712
713                         if (!--revokes)
714                                 break;
715                         offset += sizeof(u64);
716                 }
717
718                 brelse(bh);
719                 offset = sizeof(struct gfs2_meta_header);
720                 first = 0;
721         }
722
723         return 0;
724 }
725
726 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
727 {
728         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
729
730         if (error) {
731                 gfs2_revoke_clean(jd);
732                 return;
733         }
734         if (pass != 1)
735                 return;
736
737         fs_info(sdp, "jid=%u: Found %u revoke tags\n",
738                 jd->jd_jid, jd->jd_found_revokes);
739
740         gfs2_revoke_clean(jd);
741 }
742
743 /**
744  * databuf_lo_before_commit - Scan the data buffers, writing as we go
745  *
746  */
747
748 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
749 {
750         unsigned int limit = databuf_limit(sdp);
751         unsigned int nbuf;
752         if (tr == NULL)
753                 return;
754         nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
755         gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
756 }
757
758 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
759                                     struct gfs2_log_descriptor *ld,
760                                     __be64 *ptr, int pass)
761 {
762         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
763         struct gfs2_glock *gl = ip->i_gl;
764         unsigned int blks = be32_to_cpu(ld->ld_data1);
765         struct buffer_head *bh_log, *bh_ip;
766         u64 blkno;
767         u64 esc;
768         int error = 0;
769
770         if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
771                 return 0;
772
773         gfs2_replay_incr_blk(jd, &start);
774         for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
775                 blkno = be64_to_cpu(*ptr++);
776                 esc = be64_to_cpu(*ptr++);
777
778                 jd->jd_found_blocks++;
779
780                 if (gfs2_revoke_check(jd, blkno, start))
781                         continue;
782
783                 error = gfs2_replay_read_block(jd, start, &bh_log);
784                 if (error)
785                         return error;
786
787                 bh_ip = gfs2_meta_new(gl, blkno);
788                 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
789
790                 /* Unescape */
791                 if (esc) {
792                         __be32 *eptr = (__be32 *)bh_ip->b_data;
793                         *eptr = cpu_to_be32(GFS2_MAGIC);
794                 }
795                 mark_buffer_dirty(bh_ip);
796
797                 brelse(bh_log);
798                 brelse(bh_ip);
799
800                 jd->jd_replayed_blocks++;
801         }
802
803         return error;
804 }
805
806 /* FIXME: sort out accounting for log blocks etc. */
807
808 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
809 {
810         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
811         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
812
813         if (error) {
814                 gfs2_meta_sync(ip->i_gl);
815                 return;
816         }
817         if (pass != 1)
818                 return;
819
820         /* data sync? */
821         gfs2_meta_sync(ip->i_gl);
822
823         fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
824                 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
825 }
826
827 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
828 {
829         struct list_head *head;
830         struct gfs2_bufdata *bd;
831
832         if (tr == NULL)
833                 return;
834
835         head = &tr->tr_databuf;
836         while (!list_empty(head)) {
837                 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
838                 list_del_init(&bd->bd_list);
839                 gfs2_unpin(sdp, bd->bd_bh, tr);
840         }
841 }
842
843
844 const struct gfs2_log_operations gfs2_buf_lops = {
845         .lo_before_commit = buf_lo_before_commit,
846         .lo_after_commit = buf_lo_after_commit,
847         .lo_before_scan = buf_lo_before_scan,
848         .lo_scan_elements = buf_lo_scan_elements,
849         .lo_after_scan = buf_lo_after_scan,
850         .lo_name = "buf",
851 };
852
853 const struct gfs2_log_operations gfs2_revoke_lops = {
854         .lo_before_commit = revoke_lo_before_commit,
855         .lo_after_commit = revoke_lo_after_commit,
856         .lo_before_scan = revoke_lo_before_scan,
857         .lo_scan_elements = revoke_lo_scan_elements,
858         .lo_after_scan = revoke_lo_after_scan,
859         .lo_name = "revoke",
860 };
861
862 const struct gfs2_log_operations gfs2_databuf_lops = {
863         .lo_before_commit = databuf_lo_before_commit,
864         .lo_after_commit = databuf_lo_after_commit,
865         .lo_scan_elements = databuf_lo_scan_elements,
866         .lo_after_scan = databuf_lo_after_scan,
867         .lo_name = "databuf",
868 };
869
870 const struct gfs2_log_operations *gfs2_log_ops[] = {
871         &gfs2_databuf_lops,
872         &gfs2_buf_lops,
873         &gfs2_revoke_lops,
874         NULL,
875 };
876